US3797293A - Safety lock for safety equipment such as hoods for can making machinery - Google Patents

Safety lock for safety equipment such as hoods for can making machinery Download PDF

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Publication number
US3797293A
US3797293A US00325908A US3797293DA US3797293A US 3797293 A US3797293 A US 3797293A US 00325908 A US00325908 A US 00325908A US 3797293D A US3797293D A US 3797293DA US 3797293 A US3797293 A US 3797293A
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Prior art keywords
fluid pressure
engagement member
fluid
latching
pressure means
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Expired - Lifetime
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US00325908A
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English (en)
Inventor
E Paramonoff
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Sequa Corp
STANCLUN Inc
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STANCLUN Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/08—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body in connection with the locking of doors, covers, guards, or like members giving access to moving machine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems

Definitions

  • an operating mechanism communicates with a fluid cylinder which when fluid pressurized, extends a plunger into secure engagement with an engagement member in its fully engaged 'position.
  • the engagement member forms a part of safety equipment which places the engagement member in fully engaged position when closed and must be retained closed during operating mechanism operation for safety purposes.
  • a second fluid line requiring fluid pressure therein to be maintained for the starting of the operating mechanism or for the continued operation thereof communicates with a fluid vent relieving fluid pressure when open and retaining fluid pressure when closed by a ball controlled by a pivotal cantilever member.
  • the cantilever member and ball absolutely assures that the engagement member will be in fully engaged position prior to start or f orv continued operation of the operating mechanism and the cylinder and plunger positively locks the engagement member in fully engaged-position during operating mechanism operation.
  • This invention relates to a safety'lock for safety equipment such as hoods for can making machinery, and more particularly, to such a lock which is fluid actuated and is particularly useful for connection into a machine or other operating structure for sensing the operation of the operating structure and preventing the opening or removal of certain safety equipment throughout such operation, while at the same time, preventing the commencement or continued operation of such operating equipment in the event such safety equipment is opened or removed.
  • a safety'lock for safety equipment such as hoods for can making machinery
  • a lock which is fluid actuated and is particularly useful for connection into a machine or other operating structure for sensing the operation of the operating structure and preventing the opening or removal of certain safety equipment throughout such operation, while at the same time, preventing the commencement or continued operation of such operating equipment in the event such safety equipment is opened or removed.
  • the lock being fluid actuated, may preferably make use of existing fluid systems within the operating structure so that no additional fluid systems are required.
  • metallic can body making equipment such as metallic can body trimmers
  • metallic can body trimmers there are numerous component parts which, if they remain exposed during trimmer operation, can constitute a present danger of injury to operating workmen and other personnel.
  • metallic can body trimmer With a metallic can body trimmer, there are moving metal cutting knives, rotating gearing and cams, and driving motors, all of which must be accessible for adjustment and maintenance operations, yet during the operation of the trimmer can present safety hazards.
  • the obvious solution in eliminating such safety hazards is the provision of covering hoods which, although they must be capable of being opened or removed forthe adjustment and maintenance operations, will guard against access during operation thereof.
  • Such safety equipment is only of value as long as it is in place guarding access to the hazardous components during operation of the equipment and there is a tendency of workmen, at times, not to close the safety equipment or to maintain the same closed during machine operation-Thus, to completely assure that the safety equipment will be in place and closed during all operations of the operating equipment, it is essential that some means be provided for preventing operation when the safety equipment is displaced and open and only permitting operation when the safety cease, thereby protecting against any possible malfunctions.
  • an object of this invention to provide a safety lock for safety equipment such as hoods for can making machinery wherein the safety lock structure adds fail safefeatures to the safety equipmentpositively preventing operation of an operating structure being protected by the safety equipment unless. the safety equipmentis in intended and safety guarding closed position, whether at commencementof operation or displacement of the safety equipment during operation, and also positively locks the safety equipment in safety guarding position immediately upon the operation of the operating structure being commenced.
  • the initiation of operation of the operating structure is absolutely prevented until the safety equipment is closed in safety guarding position and when the safety equipment is so closed, this relationship is automatically sensed and permits the commencement of operation of the operating structure.
  • the requirements for the preferred form of the safety lock of the present invention for sole fluid operation thereof are a fluid pressure line requiring fluid under pressure therein prior to and duringany operation of the operating structure being possible and a fluid pressure line which must automatically receive fluid pressure therein immediately at the commencement andv continued operation of the operating structure.
  • the fluid pressure line which will have fluid under pressure therein prior to it being possible to start and continue operation of the operating structure might be any fluid pressure line of the usual operating structure fluid pressure system, such as a fluid pressure actuated valve or switch which is required to signify activation of the usual fluid pressure system of the operating structure before actual operation thereof may be started or continued.
  • the fluid pressure line may be some fluid pressure line in the usual fluid pressure system which must receive fluid under pressure therein in order to effect the start of operation of the operating structure, such as the fluid pressure line to a usual fluid pressure actuated clutch.
  • the safety switch merely makes use of these presently existing fluid pressure lines in conjunction with the various operating structure components already requiring such fluid pressure lines so that no true additions to the fluid pressure system are required.
  • venting of the fluid pressure line requiring fluid under pressure to be maintained therein prior to any commencement of operation or continued operation of the operating structure may be accomplished through a simple pressurized fluid venting port retained closed and maintaining fluid pressure within the fluid pressure line by a cantilever member engaged by the safety equipment in the closed position retaining a ball in the venting port closing position.
  • the locking of the safety equipment in the closed position may be accomplished through a position controlled plunger of a present actuated cylinder which is projected to extended position engaged with and securing the safety equipment in closed position when the fluid pressure is received from, for instance, the fluid actuated clutch of the operating structure.
  • FIG. 1 is a fragmentary, front elevational view of an operating structure, in this case, a metallic can body trimmer, having typical safety equipment installed .thereon and incorporating a preferred embodiment of FIG. 3 is a fragmentary, vertical sectional view looking in the direction of the arrows 33 in FIG. 2; and
  • FIG. 4 is a view similar to FIG. 3, but showing the safety equipment in open or displaced position and the safety lock of the present invention in non-locking position.
  • a preferred embocimerit embodiment the safety lock of the present invention is illustrated therein installed in can making machinery, specifically, a metallic can body trimmer generally indicated at 10 in FIG. 1 having a typical form of safety equipment, a hood 12, covering various possible injury causing movable parts such as metal cutting knives, gears, cams, clutches and driving motors.
  • the hood 12 is in closed, safety guarding and moving component covering position with a safety lock generally, indicated 14 and incorporating the principles of the present invention mounted partially on the hood 12 and partially on a frame portion of the trimmer 10 as will be explained more in detail below.
  • the hood 12 is displaceable or pivotal in usual manner upwardly and rearwardly as viewed in FIG. 1 .separating at the safety lock 14 so as to provide access to the moving components of the trimmer 10 for conducting adjustment and maintenance operations, but it is obvious that it is vital that the hood 12 remain closed as shown in FIG. 1 during operation of the trimmer 10 so as to carry out its safety guarding functions.
  • the particular environment illustrated herein for use of the safety lock 14 of the present invention is only an illustrative environment wherein thesafety lock is particularly useful. It will be clear from the following description, however, that the safety lock 14 of the present invention may be useful in many other environments, whether can making machinery or otherwise, and the only requirement is that the proper fluid pressure supplied be available for proper'operation of the same. Thus, it should be kept in mind that it is not intended to limit the principles of the present invention to the particular installation or form shown and the principles of the present invention should be broadly construed within the limits of the following claims.
  • an engagement member or tongue 16 is secured to the hood l2 and projects generally downwardly from a forward edge of the hood at the safetylock 14.
  • the tongue 16 is received downwardly within a lock frame 18 secured to a stationary frame portion of the trimmer 10.
  • the tongue 16 is in a fully engaged position shown in FIGS. 2 and 3 with an engagement opening 20 therethrough positioned within the lock' frame 18, the
  • a coil spring 28 telescopes the latching plunger 26 and normally urges the'plunger to a nonlatching position as shown in FIG. 4 free of the tongue 16 and permitting free movement of the tongue from and into its fully engaged position (FIG. 3) within the lock frame 18.
  • the piston 24 and plunger 26 are moved from the disengaged or retracted position shown in FIG. 4 to the right into the engaged or extended position shown in FIG. 3, the plunger being received through the tongue engagement opening 20 and retaining the tongue 16 in its fully engaged position when the tongue at that time has been moved to such fully engaged position.
  • a fluid sealing ring 30 surrounds the plunger 26 at its point of securement to the piston 24 and it will be noted that the sealing ring provides little, if any, sealing value when the piston 24 and plunger 26 are in the retracted or non-latching position as shown in FIG. 4. As shown in FIG. 3, however, when the piston 24 and plunger 26 are in extended latching position, the sealing ring is forced by the piston against the lock frame 18 so as to seal off the cylinder 22 around the plunger.
  • This arrangement of the sealing ring 30, therefore, presents a unique sealing arrangement of simplified form and minimum expense, as well as reducing maintenance problems while still presenting 'a functionally proper seal. Furthermore, this positioning of the sealingring 30 reduces the friction of movement of the piston 24 and plunger 26 improving response thereof to low fluid pressure levels.
  • the cylinder 22 is connected in communication with a first fluid line 32 which is associatedin the fluid distribution system of the particular operating mechanism, in this case, the trimmer so that this first fluid line positively requires fluid under at least the predetermined pressure required for moving the piston 24 and plunger 26 against the counterforce of the spring 28 when the operating mechanism or trimmer' is operated and throughout such operation.
  • first fluid line 32 will have fluid under the predetermined pressure therein and until such operation is ceased when the pressure in the first fluid line will be relieved.
  • the first fluid line 32 can be connected into communication with a fluid line supplying a fluid actuated, main driving clutch (not shown) of the trimmer, so that at comthe relief of fluid pressure thereto, this will relieve the fluid pressure in the first fluid line.
  • This fluid under pressure is preferably air, but obviously other pressurized gases or liquids could be used.
  • a second fluid pressure means is also formed in the lock frame 18 and includes a pressure chamber 34 vented through a port 36 freely through a control chamber 38 and ultimately from the lock frame 18 as shown.
  • a cantilevered control member 40 is pivotally mounted atone end in the control chamber 38 projecting in cantilever fashion over closing means for the port 36 in the form of a ball 42 overlying the control chamber end of the port.
  • a free end of the control member 40 extends, again in cantilever fashion, from the control member intermediate engagement with the ball 42 to the right into interference with the downward path of the tongue 16 when the tongue is moved into its fully engaged position.
  • the control member 40 may be formed of relatively rigid yet somewhat flexible material such asspring metal, preferably spring steel, so that when downward pressure is exerted on the free end thereof by the tongue 16, this control member can flexibly bow over the ball 42 in the manner shown in FIG. 3 and retain proper downward pressure on the ball for sealing the port 36.
  • the ball 42 can be formed of any rigid material and is preferably formed of a rigid plastic.
  • a second fluid line 44 communicates with the control chamber 38 and under the principles of the present invention'is required to have fluid under a predetermined pressure therein prior to commencement of operation of the operating mechanism, in this case the trimmer 10, and to maintain such fluid therein under the predetermined pressure throughout any operation of the operating mechanism or trimmer.
  • the second fluid line 44 could be connected in communication with the same fluid lines supplying that or these components.
  • the trimmer 10' may include a fluid pressure actuated switch or valve which requires fluid under pressure within the fluid pressure system and actuating the switch or valve in order that the trimmer can be initially operated and throughout maintenance of the same in such operation whereby, if pressurized fluid is vented from the control chamber 38, fluid pres sure will be relieved from the switch or valve and the trimmer will not either commence operation or continue operation, whereas with the control chamber 38 closedfrom venting, the pressure of the pressurized fluid will be maintained and the switch or valve will sustain initial and continued operation of the trimmer.
  • the fluid under pressure from the second fluid line 44 is preferably air, but may be any other gaseous fluid or liquid.
  • the safety lock 14 of the present invention therefore not only prevents operation of the trimmer 10 when the hood 12 is open and requires the hood to be closed prior to trimmer operation being commenced, but also provides the unique fail safe feature that if the hood is somehow opened at any time during trimmer operation, such operation will immediately cease.
  • the hood 12 throughout any operation of the trimmer or other machinery by the first pressure means or cylinder 22 with its latching plunger 26 is that the safety equipment cannot be opened at random even though it will immediately stop trimmer operation through the second pressure means including the chamber 34 and port 36.
  • Certain types of machinery require stopping thereof at a particular safe period during an operating cycle in order to prevent endangering valuable tooling and prevent improperly formed manufactured parts.
  • Such machinery has normal stopping means which may be actuated at any time during a cycle, but will only stop the machinery during the cycle safe period.
  • the safety lock 14 of the present invention normally requires use of the normal stopping means and eliminates possibility of such endangerment by maintaining positive locking of the safety equipment during any machinery operation and preventing random machinery stopping opening thereof.
  • a safety lock for use with operating mechanisms; the combination of: an engagement member movable between a fully engaged position and various disengaged positions; first fluid pressure means normally retained in a non-latching position and movable by fluid under at least a predetermined pressure to a latching position, said first fluid pressure means remaining in said non-latching position when lacking said fluid under said predetermined pressure, said first fluid pressure means in latching position securing said engagement member in fully engaged position when moved to said latching position while said engagement member is in said fully engaged position, said first fluid pressure means in non-latching position permitting movement of said engagement member between said fully engaged and various disengaged positions; first fluid line means positively requiring fluid under at least said first fluid pressure means predetermined pressure throughout operation of an operating mechanism, said first fluid line means being connected in communication with said first fluid pressure means; second fluid pressure means movable between a closed positioned retaining fluid under at least a predetermined pressure therein and venting positions venting fluid therefrom and reducing fluid pressure therein to at least below said predetermined pressure, said
  • said first fluid pressure means includes a cylinder, a piston in said cylinder and having a latching plunger operably connected thereto and movable therewith, resilient means operably connected to said piston and latching plunger normally resiliently retaining said latching plunger in said first fluid pressure means non-latching position, said latching plunger engageably securing said engagement member in said fully engaged position when moved to said first fluid pressure means latching position while said engagement member is in said fully engaged position; and in which sealing means isoperably associated with said piston of said first fluid pressure means operable for sealing fluid within said cylinder of said first fluid pressure means when said latching plunger is in said latching position and being free of complete sealing of fluid within said cylinder and permitting slight venting of said fluid from said cylinder when said latching plunger is in said non-latching position.
  • said second fluid pressure means includes'control means engaged by said engagement member when'said engagement member is in said fully engaged position moving said second fluid pressure means to said closed position, said control means moving to permit said fluid venting from said second fluid pressure means when said engagement member is moved from said fully engaged position.
  • said second fluid pressure means includes a port through which fluid may be vented from said second fluid pressure means, a ball over said port movable between said second fluid pressure means closed and venting positions, control means operably associated with said ball movable between a second fluid pressure means closed position with said ball in said closed position and a second fluid pressure means venting position with said ball in said venting position, said control means being engaged by said engagement member and moved to said closed position when said engagement member is moved into said fully engaged position, said control means moving to said venting position upon movement of said engagement member into said disengaged positions.
  • said second fluid pressure means includes control means moving said second fluid pressure means into said closed position when said control means is engaged-by said engagement member in movement of said engagement member into said fully engaged position, said control means moving to move said second fluid pressure means into said venting position through pressure of said fluid within said second fluid pressure means when said control means is permitted said movement by lack of said engagement member being in said fully engaged position.
  • said second fluid pressure means includes a port venting fluid from said second fluid pressure means when open and being free of said venting when closed, a ball overlying said port movable between port closing and opening positions, pivot means overlying said ball and moving said ball to port closing position when said pivot means is engaged by said engagement memberupon movement of said engagement member into said fully engaged position, said pivot means pivoting to release said ball and said ball being moved into port opening position by fluid within said second fluid pressure means upon said engagement member moving into said disengaged positions.
  • said second fluid pressure means includes a port opening from said second fluid pressure means and having port closing means thereover movable between a closed position closing off said port and a venting position permitting venting of fluid from said port, a cantilever member overlying said port closing means at an intermediate portion thereof and having an end portion engageable by said engagement member during movement of said engagement member into said fully engaged position, said engagement member in said fully engaged position forcing said cantilever member against said port closing means and moving said port closing means into said port closing position, said engagement member in said disengaged positions releasing and cantilever member to release said port closing means permitting saidport closing meansto move into said port venting positions.
  • said second fluid pressure means includes a port opening from said second fluid pressure means and having a ball thereover movable between a closed position closing off said port and a venting position permitting venting of fluid from saidport, a cantilever member overlying said ball at an intermediate portion thereof and having an end portion engageable by said engagement member during movement of said engagement member into said fully engaged position, said engagement member in said fully engaged position forcing said cantilever member against said ball and moving said ball into said closed position, said engagement member in said disengaged positions releasing said cantilever member to release said ball permitting said ball to move into said port venting positions.
  • a safety lock as defined in claim 1. in which said first fluid pressure means includes a latching member movable between said first fluid pressure means nonlatching and latching positions, said latching member engageably securing said engagement member in said fully engaged position when moved to said latching position while said engagement member is in said fully engaged position; and in which said second fluid pressure means includes a port through which fluid may be ventedfrom said second fluid pressure means, a ball over said port movable between said second fluid pressure means closed and venting positions, pivot means operably associated with said ball pivotal between a second fluid pressure means closed position with said ball in said closed position and a second fluid pressure means venting position with said ball in said venting position, said pivot means being engaged by said engagemerit member and moved to said closed position when said engagement member is moved into said fully engaged position, said pivot means pivoting to said venting position upon movement of said engagement member into said disengaged positions.
  • said first fluid pressure means includes a cylinder, a piston in said cylinder and having a latching plunger operably connected thereto and movable therewith, resilient means operably connected to said piston and latching plunger normally resiliently retaining said latching plunger in said first fluid pressure means non-latching position, said latching plunger engageably securing said engagement member in said fully engaged position when moved to said first fluid pressure means latching position while said engagement member is in said fully engaged position; and in which said second fluid pressure means includes a port opening from said second fluid pressure means and having a ball thereover movable between a closed position closing off said port and a venting position permitting venting of fluid from-said venting position.
  • Patent No. 3797293 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Deted March 19, 1974 Inventor(s) -EL'PIDIFOR PARAMONOFF Attesting Officer It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
US00325908A 1973-01-22 1973-01-22 Safety lock for safety equipment such as hoods for can making machinery Expired - Lifetime US3797293A (en)

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US32590873A 1973-01-22 1973-01-22

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US3797293A true US3797293A (en) 1974-03-19

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US00325908A Expired - Lifetime US3797293A (en) 1973-01-22 1973-01-22 Safety lock for safety equipment such as hoods for can making machinery

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US (1) US3797293A (xx)
JP (1) JPS539437B2 (xx)
AU (1) AU457950B2 (xx)
CA (1) CA972396A (xx)
FR (1) FR2214857B1 (xx)
GB (1) GB1397679A (xx)
IT (1) IT1004766B (xx)
NL (1) NL7400068A (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549425A (en) * 1983-07-14 1985-10-29 The National Machinery Company Forging machine transfer with misalignment detector
US5383397A (en) * 1993-05-06 1995-01-24 Kcs Industries Inc. Oil filter crushing apparatus
CN109500140A (zh) * 2017-09-14 2019-03-22 张家港市沙源检测技术有限公司 一种具有顶部显示结构的工件生产用防错装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2584175Y2 (ja) * 1993-11-11 1998-10-30 双葉電子工業株式会社 保護カバー装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563296A (en) * 1946-07-27 1951-08-07 Lockheed Aircraft Corp Safety device
US2683515A (en) * 1949-02-18 1954-07-13 Hoffman Engineering Corp Automatic safety guard for power presses
US3554067A (en) * 1969-02-26 1971-01-12 Joseph Scutella Fail-safe double-action safety guard

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563296A (en) * 1946-07-27 1951-08-07 Lockheed Aircraft Corp Safety device
US2683515A (en) * 1949-02-18 1954-07-13 Hoffman Engineering Corp Automatic safety guard for power presses
US3554067A (en) * 1969-02-26 1971-01-12 Joseph Scutella Fail-safe double-action safety guard

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549425A (en) * 1983-07-14 1985-10-29 The National Machinery Company Forging machine transfer with misalignment detector
US5383397A (en) * 1993-05-06 1995-01-24 Kcs Industries Inc. Oil filter crushing apparatus
CN109500140A (zh) * 2017-09-14 2019-03-22 张家港市沙源检测技术有限公司 一种具有顶部显示结构的工件生产用防错装置

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Publication number Publication date
FR2214857A1 (xx) 1974-08-19
AU457950B2 (en) 1975-02-13
DE2400474B2 (de) 1975-08-14
JPS49103879A (xx) 1974-10-01
FR2214857B1 (xx) 1976-10-08
DE2400474A1 (de) 1974-08-08
NL7400068A (xx) 1974-07-24
IT1004766B (it) 1976-07-20
CA972396A (en) 1975-08-05
AU6337873A (en) 1975-02-13
GB1397679A (en) 1975-06-18
JPS539437B2 (xx) 1978-04-05

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Owner name: SEQUA CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:SUN CHEMICAL CORPORATION, A CORP. OF DE.;REEL/FRAME:004770/0239

Effective date: 19870507